| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Nucleation Process of the Silica Nanoparticles: Ⅱ. Visualization of the Nucleation Stage |
| REN Gaoyuan1,2, SU Hongjiu1, WANG Shudong1
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1 Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
2 Energy College, University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Most silica belongs to noncrystalline phase in nature and the morphology of amorphous materials is irregular and uncontrollable during nucleation. However, nucleation process of silica particles is significant for controlling the morphology of nanoparticles. In this work, silica nanoparticles were prepared by ion exchange method with the sodium silicate as the raw material. During the synthetization process, the nucleation process of silica nanoparticles was investigated by visualization characterization like transmission electron microscope (TEM), dynamic light scattering (DLS) and pH detection. It was found that there were four stages in the nucleation of silica nanoparticles, the preparatory stage, the transitional stage, the nucleation stage and the growth stage. The morphology of different stages is different and the duration is different as well. The whole process can last more than 6 h.
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Published: 25 June 2022
Online: 2022-06-24
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2022, Vol. 36 
